Automatic razor-blade sharpener



March -16 1926.

W. H. KRUEGER AUTOMATIC RAzon BLADE. SHARPENER 51H70: new

Patented Mar. 16, 1926.

unir {ED} STATES 'PATENT oiiffifixc:e.l

WILLIAM n. Kanasna, or WIriKas-:eaaan P'anNevivaivra.

.AUTOMATIC ynAzon-inanr. sHAJaPnNER.

application mea rune 15, 1922. seriaiNo. 568,552.

Ta all 107mm t may concern.' l

Be it known that I, WVU-,MAM H. Kiinucnn,

a citizen ofthe United States,` and lresidr in which the guide frame through which the strop is -drawn back and forth and which -carries the holder" for the bladefto besharpl cned, isV free to move sol that such guide frame will be free to changeits position depending*uponfthe direction in'which the strop is drawn through thev'frame. A further object is to` provide a construction of this kind inwhich'the spring for: automatically rewinding `the stropis so mounted in the device as to be easily removable therefrom, thus permitting thereplacement of a spring or the changing of the tension of 'the spring. A further object is to provide a strop lug or plate on the free end of the strop which plate is so arranged as to engage` av ysuitable part of the guide frame to -limit the inward movement o f the strop.

The foregoing` and other useful objects which will be apparent from the construction herein described are accomplished by means of the `mechanism illustrated inthe accompanying drawings in fvvliich: l

Figure f1 is a side `elevation of 'the' device w-ith certain partsv appearing in sec-V tion, this view being "taken substantially on the line-1 1 of Figure 2;'.

Figure 2 is a plan view vof the device, parts beingshown in section;

Figure 3 is a longitudinal vertical Ysectional view on the line 3 3 of Figure 2; and

Figure is a broken sectional view of a portion of the device. n

Referring to the drawings in detail, the numeral 10 indicates a bracket which is adapted to be rigidly secured in position on a suitable support. This bracket is provided with arms 11 in which a rod 12 is supported, the ends of this rod being threaded to receive nuts 13. Upon the rod312 there is mounted a drum or casing, 14, preferably 'fit in thel ends of the casing.

vided with a cap or cover 15 which closely Within the cylindricalin shape, within which the strop is "adapted to be wound, as hereinafter described. Each end of the casing 111 1s procasing 14 afdrum or barrel 16is rotatably a length suflicient to extendl betweenthe caps .15 of the casing. Y Into one end of the casing 14 there Jis inserteda springrup' or receptacle-17, this receptacle being constructed to closely lit within the casing in which itis held against rotation relativeA to the casing 'by 'means of an outwardly projecting stud 18, such as the head of a'bolt or screw,which vmounted on' the rod 12, this druinf being of i' stud is adapted toy engage a slot'v or groove 19 formed 1n the inner surface of the casing 14. It will'be apparent thatfwhen the stud or lug 18 on the spring receptaclek 17 is positioned vvitliii'i, the groove 19 of the casing, the receptacle will be held'against rotation relativeto the casing. f

l/Vithinthe receptacle 17 Vthere is arranged a coiled spring 2O the inner end of which is secured to the drum 16 and the outer end tothe wall ofthe vreceptacle 17. Thisspring is'secu'red to the drum 16 by having the end `thereof bent to`forin a hooked portion 2l whichengages a groove 22km the periphery of the drum 16. lf 1desired,'v hoiv.fever, the springm'ay be rigidly secured toithe drum in any suitable manner, as by means of a setscrew. 'i

fA strop 23 is also secured to the drum 16 in any suitable manner as by screws 24,

the stop being arranged to beirwoundupon the drum as 1t 1s drawn into'th'e casing Vby means of the action of the spring 2,0. It

will be observed that the springreceptacle ,17 is provided with a wall 17a whichpro-v jects inwardly from the periphery: thereof f and wfhich/ forms a partitionbetween the "spring 2O andthe ,strop 23:."Itwill .also be 'understoodn that the spring receptacle`` 17 is removably mounted inthecasing. 141.' AThis permits easy replacement of 'the .spring 2O if thesame becomes 'brok'en'i It also enables the tension of the spring to be changed. For example, by detachingthe stud 18 from the,

slot 19 the receptacle 17 can be partially withdrawn from the drum without detach@ ing the spring from the drum 16 and after being thus partially withdrawn the receptacle may be rotated one vor more revolutions to tighten or loosen the spring as de-v sired after which the stud 18 is again caused to enter the slot 19. For thus withdrawing and rotating the receptacle 17 a suitable tool similar to a spanner wrench may be inserted in the holes 17 in the receptacle.

Rigidly secured to the casing 14 is a suitable guide frame through which the strop is adapted to pass as it is drawn from, and into the casing. This frame comprises side members 25 which are permanently 'secured to the casing 1e and which are held inrigid relation to each other by suitable rods such as 26. A shaft 27 is rotatably mounted in the guide frame between the members 25 thereof, the outer surface of this shaft preferably being roughened so that rotation of the same will be caused by `frictional engagement of the strop therewith. Two of the rods 26 of the guide frame are so positioned as to hold the strop in frictional engagement with the shaft 27 so that as the strop is drawn back and forth through the frame the shaft will be caused to rotate. In other words, two of the rods 2G and the shaft 27 are arranged in substantially the same plane and the strop is passed through these rods and in Vengagement with the shaft so thatthe same will be bent out of a straight line and thus will frictionally engage and cause rotation of the shaftas it is moved past the shaft.

A second shaft 28 is also rotatably supported in the guide frame parallel to the shaft 27 and a blade holder 29 is secured to the shaft 28. The shafts Q7 and 2S are provided with cooperating gear wheels 27 and 28 by which rotation of the shaft 28 is caused to take place when the shaft 27 is rotated by the movement of the strop back and forth through the guide frame. It will be understood that the blade holder is so positioned that a blade mounted therein will be brought into Contact with the strop first on one side and then on the other of the shaft 27 so that alternate sides of the blade will be acted upon by the strop as the same moves back and forth through the guide frame.

The free end of the. strop 23 is provided with a suitable handle 30 for operating the same. To limit the inward movement of the strop and the handle 30 attached thereto, there is provided a stop plate 31 which is secured to the strop in any suitable manner and which projects toward lthe guide frame. Preferably, the stop plate 31 is formed by a continuation of one side of a metal slip 32 by which the handle 30 is secured to the strop 23. The stop plate 31 is preferably slightly curved and extends over the surface of the strop. Two of the rods 26 of the guide frame are so arranged as to be engaged by the stop plate 31 when the strop is drawn inwardly. The guide plate is so proportioned that it is capable of engaging over one of the rods 26 with the free end thereof lying against the other of said rods.

Having thus described the invention what is claimed as new and desired to be secured by LettersPatent is:

1. In a stropping device, in combination, a bracket adapted to be secured to a support, a rod mounted in said bracket, a casing supported on said rod, a 'spring receptacle removably and non-rotatably mounted in said casing, a drum rotatably mounted on said rod and extending into said receptacle, a spring arranged in said receptacle and having one end connected to the receptacle and the other end connected to said drum, whereby a strop connected to said drum will be automatically wound thereon when unwound therefrom, a guide frame rigidly secured to said casing, a blade holder pivot-- ally mounted in 'said frame, and means operated by vmovement of a strop through said guide frame for oscillating said holder.

2. In a stropping device, in combination, a drum, a strop secured thereto and wound thereon, means for automatically rewinding the strop on said drum after it has been unwound therefrom, a guide frame through which the strop is adapted to pass as it is drawn from said drum and rewound thereon, a blade holder pivotallyv supported in said fame, means operated by movement of said strop for oscillating said blade holder, and means for limiting the inward movement ofvsaid strop as it is wound on said drum, said last named means comprising a stop plate securedto said strop adjacent the free end thereof and extending over the surface thereof, a bar on said frame over which said plate is adapted to engage when the strop is drawn inwardly and a second bar on said frame againstwhich the end of said plate is adapted to lie.

In testimony whereof I hereunto aflix my signature.

VILLIAM H. KRUEGER. 

